//include headers; these are modules that include functions that you may use in your
//program; we will almost always need to include the header that
// defines cin and cout; the header is called iostream.h
#include <iostream.h>
int main() {
//variable declaration
//read values input from user
//computation and print output to user
return 0;
}
After you write a C++ program you compile it; that is, you run a program called compiler that checks whether the program follows the C++ syntax
–if it finds errors, it lists them
–If there are no errors, it translates the C++ program into a program in machine language which you can execute
Notes:
•what follows after // on the same line is considered comment
•indentation is for the convenience of the reader; compiler ignores all spaces and new line ; the delimiter for the compiler is the semicolon
•all statements ended by semicolon
•Lower vs. upper case matters!!
–Void is different than void
–Main is different that main
Variable declaration
The infamous
Hello world program
Hello world program
When learning a new language, the first program people usually write is one that salutes the world :)
Here is the Hello world program in C++.
#include <iostream.h>
int main() {
cout << “Hello world!”;
return 0;
}
type variable-name;
Meaning: variable <variable-name> will be a variable of type <type>
Where type can be:
–int //integer
–double //real number
–char //character
Example:
int a, b, c;
double x;
int sum;
char my-character;